A thing I hate to loveSomehow - I should love Microsoft more then anything.
1] They have served me with OS for 10 years - nearly for free (OEM)
2] They are the standard / monopoly - and I use that for BullGuard to make my living. I would be hard to support an extra OS (we don't have Apple support).

To the point.
I have to say that messenger 6.0 seems good. My big daugther Lisa is very happy with it - and I think the Display picture thing s VERY GOOD - since it makes it soo personal somehow.